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bl_functions.py
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bl_functions.py
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import os
import pandas as pd
import TELocations as teloc
import numpy as np
import re
file_dict = {
'Avg_Vx' : "B00001.dat",
'Avg_Vy' : "B00002.dat",
'Length_of_Avg_V' : "B00003.dat",
'Standard_deviation_of_Vx' : "B00004.dat",
'Standard_deviation_of_Vy' : "B00005.dat",
'Length_of_Standard_deviation_of_V' : "B00006.dat",
'Turbulent_kinetec_energy' : "B00007.dat",
'Reynold_stress_XY' : "B00008.dat",
'Reynold_stress_XX' : "B00009.dat",
'Reynold_stress_YY' : "B00010.dat",
}
davis_dict = {
'Avg_Vx' : 'Avg_Vx' ,
'Avg_Vy' : 'Avg_Vy' ,
'Length_of_Avg_V' : 'Length_of_Avg_V' ,
'Standard_deviation_of_Vx' : 'RMS_Vx' ,
'Standard_deviation_of_Vy' : 'RMS_Vy' ,
'Length_of_Standard_deviation_of_V' : 'Length_of_RMS_V' ,
'Turbulent_kinetec_energy' : 'Turbulent_kinetec_energy' ,
'Reynold_stress_XY' : 'Reynold_stress_XY' ,
'Reynold_stress_XX' : 'Reynold_stress_XX' ,
'Reynold_stress_YY' : 'Reynold_stress_YY' ,
}
need_to_stitch_cases = [
'STE_A6_U20_closed_SS',
'STE_SS_a12_U20',
'STE_SS_a12_U30',
'STE_SS_a12_U35',
'STE_SS_a12_U40',
]
BL_pct = 95
root = './Data'
raw_data_root = '/media/carlos/6E34D2CD34D29783/2015-07_BL/STE_BL_Data/'
data_folders = [f for f in os.listdir(root) \
if os.path.isfile(os.path.join(root,f))
and f.endswith(".p")]
try:
raw_data_folders = [f for f in os.listdir(raw_data_root) \
if os.path.isdir(os.path.join(raw_data_root,f))]
except OSError:
raw_data_folders = []
def read_data(root,case,variable):
""" Reads the data. Prioritize reading an existing pickle
of the data"""
import os
import pandas as pd
if os.path.isfile(
os.path.join(root,case)
):
return pd.read_pickle(
os.path.join(root,case)
)
else:
tecplot_file = os.path.join(root,case,file_dict[variable])
return read_tecplot(tecplot_file)
def stitch_cases(frame1_df,frame2_df,case,plot=False):
import matplotlib.pyplot as plt
import seaborn as sns
sns.__version__
te_location = teloc.TELocations[
recognize_case(case)[0]
][1]
y1 = find_nearest(float(te_location[1]),frame1_df.y.unique())
y2 = find_nearest(float(te_location[1]),frame2_df.y.unique())
frame1_df_TE = frame1_df[(frame1_df.y == y1)]
frame2_df_TE = frame2_df[(frame2_df.y == y2)]
near_frame_max = frame1_df_TE.Length_of_Avg_V.max()
frame2_shift = frame2_df_TE[
frame2_df_TE.Length_of_Avg_V == find_nearest(
near_frame_max,
frame2_df_TE.Length_of_Avg_V.values)
].x.values[-1]
frame2_df_TE = frame2_df_TE[frame2_df_TE.x<=frame2_shift]
frame2_df_TE.x = frame2_df_TE.x - \
frame2_shift + frame1_df_TE.x.min()
if plot:
fig = plt.figure()
plt.plot(
frame1_df_TE.x,
frame1_df_TE.Length_of_Avg_V,
)
plt.plot(
frame2_df_TE.x,
frame2_df_TE.Length_of_Avg_V,
)
plt.title(case)
plt.savefig('test.png')
frame2_df_TE = frame2_df_TE[frame2_df_TE.x<frame1_df_TE.x.min()]
frame2_df.x = frame2_df.x - frame2_shift+frame1_df_TE.x.min()
stitched_frames = frame1_df_TE.append(
frame2_df_TE
)
return stitched_frames.sort('x')
def extract_case_details_from_name(case_name):
""" Returns a dictionary of the case details that are extracted
from the passed name
Input: case data file name
Output: a dictionary
"""
from re import findall
alpha = int(findall("[Aa][0-9][0-9]?",case_name)[0]\
.replace('A','')\
.replace('a',''))
speed = int(findall("U[0-9][0-9]",case_name)[0].replace("U",''))
if 'PS' in case_name or "SS" in case_name:
side = findall("[PS]S",case_name)[0]
else:
side = "zero alpha"
if "closed" in case_name:
test_section = 'closed'
elif "open" in case_name:
test_section = 'open'
else:
test_section = 'unknown'
case_details = {
'alpha' : alpha,
'speed' : speed,
'side' : side,
'test_section' : test_section
}
return case_details
def build_plot_case_label_from_dict(case_details):
""" Turns the case details dictionary and returns a label that
can be used for plotting
Input: case details dictionary
Output: label
"""
label = "$\\alpha = {{{0}}}^\\circ$, $U_\\infty = {{{1}}}\\,\\mathrc{{m/s}}$".\
format(case_details['alpha'],case_details['speed'])
return label
def plot_article_bls(fig_name = 'BoundaryLayers.png'):
from matplotlib import pyplot as plt
import pandas as pd
import seaborn as sns
from matplotlib import rc
from numpy import argmin,array
rc('text',usetex=True)
sns.set_context('paper')
sns.set_style("whitegrid")
sns.set(font='serif',font_scale=2.5,style='whitegrid')
rc('font',family='serif', serif='cm10')
line_styles = ['--','-.',':']
markers = [
u'o', u'v', u'^', u'<', u'>', u'8', u's', u'p', u'*',
u'h', u'H', u'D', u'd'
]
colors = [
'#013F70',
'#70A288',
'#D5896F',
'#BB9F06',
'#DAB785',
]
bls_df = pd.DataFrame()
for case in data_folders:
x,y,df = get_bl(case,variable='Avg_Vy')
df['case'] = case
bls_df = bls_df.append(df)
cases = bls_df.case.unique()
alphas = array([0,6,12])
fig,ax = plt.subplots(1,1)
for case in [c for c in cases \
if not 'closed' in c and not 'PS' in c]:
case_dict = extract_case_details_from_name( case )
data = bls_df[bls_df.case==case]
vel = data.Avg_Vy / data.Avg_Vy.max()
y = data.x
ax.scatter(vel,y,
label = build_plot_case_label_from_dict(case_dict),
marker = markers[
argmin(abs(
case_dict['alpha'] - alphas
))
],
color = colors[
argmin(abs(
case_dict['alpha'] - alphas
))
],
alpha = 0.2
)
plt.savefig(fig_name)
return bls_df
def plot_surface(case,variable='Avg_Vy'):
from matplotlib import pyplot as plt
import seaborn as sns
sns.set(context="notebook", style="whitegrid",
rc={"axes.axisbelow": False,'image.cmap': 'YlOrRd'})
df = read_data(root,case,variable)
X,Y = np.meshgrid(df.x.unique(),df.y.unique())
Z = df[variable].reshape(X.shape)
te_location = teloc.TELocations[
recognize_case(case)[0]
][1]
bl_data,points = get_bl(case=case,variable=variable)
delta_BL,vel_BL,U_max = find_bl(case=case,variable=variable)
points = -points+te_location[0]
delta_BL = -delta_BL+te_location[0]
levels = np.linspace(float(Z.min()),float(Z.max())+1,30)
fig = plt.figure()
ax = plt.subplot(111,aspect=1)
ax.contourf(X,Y,Z,levels=levels)
C = ax.contour(X, Y, Z, levels=levels,
colors = ('k',),
linewidths = (1,),
)
ax.clabel(C, inline=1, fontsize=10,color='w')
ax.scatter(points,[te_location[1]]*len(points),s=10,color='k')
ax.scatter(delta_BL,te_location[1],s=40,color='k')
ax.scatter(delta_BL,te_location[1],marker='x',s=80,color='k')
plt.savefig('images/Surface_{0}.png'.format(case))
fig.clear()
def read_tecplot(root,case_folder,variables_to_read):
"""Reads in the tecplot file, stitches the 2 frames
and returns a pandas data frame with the requested variables
Input:
tecplot formated file
Output:
pandas data frame
"""
import os
for var in variables_to_read:
tecplot_file = os.path.join(root,case_folder,file_dict[var])
# Get available variables
f = open(tecplot_file,'ro')
variables = []
# Do two things:
# 1) Grab the important info from the header
# 2) See where the second frame info starts so that
# it passes it later to the pandas reader
var_string = 0
end_line = 0
final_line = 0
stop_frame_count = False
for line in f:
if not stop_frame_count:
end_line+=1
if 'Frame 2' in line:
stop_frame_count = True
if not var_string:
var_string = re.findall("^VARIABLES[ _A-Za-z0-9,\"=]+",line)
if var_string:
variables = [
v.replace(' ','_').replace("\"","") \
for v in var_string[0].replace("VARIABLES = ",'').\
split(", ")
]
variables = [v for v in variables if len(v)]
final_line += 1
f.close()
lines_to_skip = range(0,3)+range(end_line-1,final_line)
if var == variables_to_read[0]:
# Put the first frame data into a data frame
data_frame1 = pd.read_table(
tecplot_file,
skiprows = lines_to_skip,
names = variables,
sep = '[ \t]+',
index_col = False,
dtype = np.float
)
# Put the second frame data into a data frame
data_frame2 = pd.read_table(
tecplot_file,
skiprows = range(0,end_line),
names = variables,
sep = '[ \t]+',
index_col = False,
dtype = np.float
)
else:
# Put the first frame data into a data frame
df1_tmp = pd.read_table(
tecplot_file,
skiprows = lines_to_skip,
names = variables,
sep = '[ \t]+',
index_col = False,
dtype = np.float
)
# Put the second frame data into a data frame
df2_tmp = pd.read_table(
tecplot_file,
skiprows = range(0,end_line),
names = variables,
sep = '[ \t]+',
index_col = False,
dtype = np.float
)
if not var in df2_tmp.columns or not var in df1_tmp.columns:
data_frame1[var] = df1_tmp[davis_dict[var]]
data_frame2[var] = df2_tmp[davis_dict[var]]
else:
data_frame1[var] = df1_tmp[var]
data_frame2[var] = df2_tmp[var]
# Crop the data
data_frame1 = data_frame1[
(data_frame1.x < data_frame1.x.max()*0.90) &\
(data_frame1.x > data_frame1.x.min()*1.10) &\
(data_frame1.y < data_frame1.y.max()*0.90) &\
(data_frame1.y > data_frame1.y.min()*1.10)
]
data_frame2 = data_frame2[
(data_frame2.x < data_frame2.x.max()*0.90) &\
(data_frame2.x > data_frame2.x.min()*1.10) &\
(data_frame2.y < data_frame2.y.max()*0.90) &\
(data_frame2.y > data_frame2.y.min()*1.10)
]
data = stitch_cases(data_frame1, data_frame2,case_folder)
return data
def pickle_all_data(root,case_name):
""" Meant to be used only once... pickles the (relevant)
TECPLOT data into a single file
Input:
TECPLOT file folder
"""
variables_to_read = [
'Avg_Vx',
'Avg_Vy',
'Length_of_Avg_V',
'Length_of_Standard_deviation_of_V'
]
df = read_tecplot(raw_data_root,case_name,variables_to_read)
# Only extract the trailing edge wall normal line
te_location = teloc.TELocations[
recognize_case(case_name)[0]
][1]
x = find_nearest(float(te_location[0]),df.x.unique())
y = find_nearest(float(te_location[1]),df.y.unique())
df = df[
(df.y == y) &\
(df.x < x)
]
df.to_pickle(os.path.join(root,case_name+'.p'))
def find_nearest(to_point,from_array):
""" Finds the nearest available value in a array to a given value
Inputs:
to_point: value to find the nearest to in the array
from_array: array of available values
Returns:
The nearest value found in the array
"""
deltas = np.ones(len(from_array))*1000
for v,i in zip(from_array,range(len(from_array))):
deltas[i] = abs(float(to_point) - float(v))
return from_array[np.argmin(deltas)]
def recognize_case(case_name):
""" Separates the case name folder into its distinctive parameters
used in this campaign
Input: folder name
Output:
the key of the TELocations dictionary it belongs to
case parameters [alpha,side,test_section]
"""
alpha = int(re.findall('[Aa][0-9][0-9]?',case_name)[0]\
.replace('A','').replace('a',''))
try:
side = re.findall('PS',case_name)[0]
except:
side = 'SS'
try:
test_section = re.findall('closed',case_name)[0]
except:
test_section = 'open'
# A complicated search for equal terms in the dictionary keys and
# the case parameters
# (that's what happens when you don't use standard nomenclature)
case_key = ''
for keys,values in zip(
teloc.TELocations.keys(),
teloc.TELocations.values()
):
if test_section == values[0]:
if alpha == int(re.findall('[Aa][0-9][0-9]?',keys)[0]\
.replace('A','').replace('a','')):
if alpha: # Hey, alpha = 0 has no side
if side == re.findall('[PS]S',keys)[0]:
case_key = keys
break
elif alpha==0:
case_key = keys
break
case_parameters = [alpha,side,test_section]
return case_key, case_parameters
def get_bl(case,variable='Length_of_Avg_V'):
""" Get the TE boundary layer information and return it as an array
Input:
tecplot file location
Output:
array of flow velocity values
locations of those velocity vectors
"""
from numpy import sin,cos,tan
from math import atan
root = './Data'
te_location = teloc.TELocations[
recognize_case(case)[0]
][1]
df = read_data(root,case,variable)
# Get the angular value of the flow in the "freestream"
freestream_location_min = df.x.min()*0.95
freestream_location_max = df.x.min()*0.80
vy_in_the_freestream = df[
(df.x < freestream_location_max) & \
(df.x > freestream_location_min)
].Avg_Vy.mean()
vx_in_the_freestream = df[
(df.x < freestream_location_max) & \
(df.x > freestream_location_min)
].Avg_Vx.mean()
deviation_angle = atan(vx_in_the_freestream/vy_in_the_freestream)
df.Avg_Vy = df.Avg_Vy / cos(-deviation_angle)
df.Avg_Vx = df.Avg_Vy * tan(-deviation_angle)
bl_data = np.array(map(float,df.Avg_Vy.values))
points = -(np.array(map(float,df['x'].values))-te_location[0])
df.x = - ( df.x - te_location[0])
df = df.sort('x')
df = remove_outliers(df)
bl_data = moving_average(bl_data,n=50)
df = get_averaged_data(df,n=50)
return bl_data,points,df
def remove_outliers(df):
#def reject_outliers(data, m=2):
# return data[abs(data - np.mean(data)) < m * np.std(data)]
from scipy import stats
return df[(np.abs(stats.zscore(df)) < 3).all(axis=1)]
#df.Avg_Vy = df.Avg_Vy
def get_averaged_data(df,n=50):
import pandas as pd
variables = df.columns
new_df = pd.DataFrame(columns=variables)
for v in variables:
new_df[v] = moving_average(df[v].values,n=n)
return new_df
def moving_average(a, n=3) :
ret = np.cumsum(a, dtype=float)
ret[n:] = ret[n:] - ret[:-n]
return ret[n - 1:] / n
def plot_bl(case,variable='Avg_Vy'):
from matplotlib import pyplot as plt
import seaborn as sns
current_palette = sns.color_palette()
x,y,df = get_bl(case,variable)
fig = plt.figure()
ax = plt.subplot(111)
ax.scatter(
df.Avg_Vy.values/df.Avg_Vy.max(),
df.x,
marker='x',
c=current_palette[0]
)
ax.scatter(
df.Length_of_Standard_deviation_of_V.values/\
df.Length_of_Standard_deviation_of_V.max(),
df.x,
marker='x',
c=current_palette[1]
)
loc_BL,vel_BL,U_max = find_bl(case)
loc_BL = float(loc_BL)
ax.axhline(y=loc_BL,ls='--',color='r',lw=2)
ax.text(0.8*ax.get_xlim()[1],
loc_BL,
'$\\delta_{{{1}}} ={0:.2f} $ mm'.format(loc_BL,BL_pct),
ha='right',va='bottom'
)
ax.text(0.87*ax.get_xlim()[1],
df.x.max(),
'$U ={0:.2f} $ m/s'.format(
df[df.x==df.x.max()].Avg_Vy.values[0]
),
ha='right',va='center',rotation=-90
)
ax.set_xlabel(
'$U/U_\\mathrm{max}$ (blue), $U_\\mathrm{rms}/U_\\mathrm{rms,max}$ (green)'
)
ax.set_ylabel('$y$ [mm]')
ax.set_ylim(0,45)
ax.set_xlim(0,1)
plt.title(case.replace('.p',''))
plt.savefig('images/BL_{0}.png'.format(case.replace('.p','')))
fig.clear()
def find_bl(case,variable='Length_of_Avg_V'):
vel,loc,df = get_bl(case,variable)
vel_BL = df.Avg_Vy.max()*BL_pct/100.
delta_BL = df[df.Avg_Vy==find_nearest(vel_BL,df.Avg_Vy.values)].x
#vy_BL = df[
# df.Avg_Vy==find_nearest(vel_BL,df.Avg_Vy.values)
#].Avg_Vy.values[0]
#vx_BL = df[
# df.Avg_Vy==find_nearest(vel_BL,df.Avg_Vy.values)
#].Avg_Vx.values[0]
#for v,l in zip(vel[::-1],loc[::-1]):
# if v>vel_BL:
# delta_BL = l
# break
return delta_BL,vel_BL,df.Avg_Vy.max()
def make_csv(out_file="BL_Data_Info.csv"):
import pandas as pd
from re import findall
from os.path import join
bl_info_DF = pd.DataFrame(
columns = [
'U',
'alpha',
'Delta_BL',
'U_BL',
'Side',
'Test_section'
])
variable = 'Length_of_Avg_V'
for case in data_folders:
alpha = findall("_[aA][0-9][0-9]?",case)[0].\
replace("_a","").\
replace("_A","")
U_inf = findall("_U[0-9][0-9]?",case)[0].replace("_U","")
if len(findall("[PS]S",case)):
side = findall("[PS]S",case)[0]
else: side = "NA"
if len(findall("closed",case)):
test_section = findall("closed",case)[0]
else: test_section = "open"
Delta_BL,U_BL,U_max = find_bl(case,variable=variable)
bl_info_DF = bl_info_DF.append({
'U' : float(U_inf),
'U_max' : U_max,
'alpha' : float(alpha),
'Delta_BL' : float(Delta_BL),
'U_BL' : float(U_BL),
'Side' : side,
'Test_section' : test_section
},ignore_index=True)
if out_file:
bl_info_DF.to_csv(join("outputs",out_file))
return bl_info_DF
def plot_all_deltas(out_file="All_Deltas.png"):
import matplotlib.pyplot as plt
import seaborn as sns
from numpy import argmin,abs
import os
sns.__version__
bl_info_DF = make_csv(out_file='')
bl_info_DF = bl_info_DF.sort("U_inf")
cmap_SS = sns.color_palette("Reds_r",len(bl_info_DF.U_inf.unique()))
cmap_PS = sns.color_palette("Blues_r",len(bl_info_DF.U_inf.unique()))
# Marker defines if open or closed
marker = {
'open' : 'o',
'closed' : 'x',
}
fig,ax = plt.subplots(1,1)
for row_index, row in bl_info_DF.iterrows():
if row.Side == 'SS' or row.Side == 'NA':
cmap = cmap_SS
else:
cmap = cmap_PS
if row.Side=='NA':
label_side = ''
else: label_side = row.Side
label = "$U_\\infty = {0}$ m/s {1}".\
format(row.U_inf,label_side)
ax.scatter(
row.alpha,
row.Delta_BL,
color = cmap[
argmin(abs(bl_info_DF.U_inf.unique()-row.U_inf))
],
marker = marker[row.Test_section],
s=75,
label = label
)
ax.annotate(label,
xy=(row.alpha,row.Delta_BL),
xytext=(row.alpha+1,row.Delta_BL+0.5),
arrowprops=dict(
facecolor='black',
arrowstyle='->',
lw=2
),
)
ax.set_xticks([0,6,12])
ax.set_xlim(-2,16)
ax.set_xlabel("$\\alpha_g$ [deg]")
ax.set_ylabel("$\\delta_{{{0}}}$ [mm]".format(BL_pct))
#ax.legend(loc='best')
plt.savefig(os.path.join('images',out_file))
#variable = 'Length_of_Standard_deviation_of_V'
##variable = 'Length_of_Avg_V'
#import os
#variables_to_read = [
# 'Avg_Vx',
# 'Avg_Vy',
# 'Length_of_Avg_V',
# 'Length_of_Standard_deviation_of_V'
#]
#
##for case in [raw_data_folders[2]]:
## read_tecplot(raw_data_root,case,variables_to_read)
## pickle_all_data(raw_data_root,case)
##for case in data_folders:
## plot_bl(case,variable)
# #plot_surface(case,variable)
#plot_all_deltas()
#
#def plot_all_BLs():
# for case in data_folders:
# plot_bl(case,variable)
#
#def pickle():
# for case in raw_data_folders:
# pickle_all_data(raw_data_root,case)
#
##pickle()
#plot_all_BLs()